<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="static/plugins/bootstrap-3.4.1/css/bootstrap.css">
    <!-- <link rel="stylesheet" href="/static/plugins/bootstrap-3.4.1/css/bootstrap.min.css"> -->


</head>

<body>


    <input type="button" class="btn btn-primary btn-xs" value="按钮" />
    <input type="button" class="btn btn-success" value="按钮" />
    <input type="button" class="btn btn-primary" value="按钮" />
    <input type="button" class="btn btn-danger" value="按钮" />
    <input type="button" value="按钮" />


</body>

</html>